michael@0: /*
michael@0:  * Copyright © 2013  Google, Inc.
michael@0:  *
michael@0:  *  This is part of HarfBuzz, a text shaping library.
michael@0:  *
michael@0:  * Permission is hereby granted, without written agreement and without
michael@0:  * license or royalty fees, to use, copy, modify, and distribute this
michael@0:  * software and its documentation for any purpose, provided that the
michael@0:  * above copyright notice and the following two paragraphs appear in
michael@0:  * all copies of this software.
michael@0:  *
michael@0:  * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
michael@0:  * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
michael@0:  * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
michael@0:  * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
michael@0:  * DAMAGE.
michael@0:  *
michael@0:  * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
michael@0:  * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
michael@0:  * FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
michael@0:  * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
michael@0:  * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
michael@0:  *
michael@0:  * Google Author(s): Behdad Esfahbod
michael@0:  */
michael@0: 
michael@0: #ifndef HB_BUFFER_DESERIALIZE_JSON_HH
michael@0: #define HB_BUFFER_DESERIALIZE_JSON_HH
michael@0: 
michael@0: #include "hb-private.hh"
michael@0: 
michael@0: %%{
michael@0: 
michael@0: machine deserialize_json;
michael@0: alphtype unsigned char;
michael@0: write data;
michael@0: 
michael@0: action clear_item {
michael@0: 	memset (&info, 0, sizeof (info));
michael@0: 	memset (&pos , 0, sizeof (pos ));
michael@0: }
michael@0: 
michael@0: action add_item {
michael@0: 	buffer->add_info (info);
michael@0: 	if (buffer->in_error)
michael@0: 	  return false;
michael@0: 	buffer->pos[buffer->len - 1] = pos;
michael@0: 	*end_ptr = p;
michael@0: }
michael@0: 
michael@0: action tok {
michael@0: 	tok = p;
michael@0: }
michael@0: 
michael@0: action parse_glyph {
michael@0: 	if (!hb_font_glyph_from_string (font,
michael@0: 					tok, p - tok,
michael@0: 					&info.codepoint))
michael@0: 	  return false;
michael@0: }
michael@0: 
michael@0: action parse_gid       { if (!parse_uint (tok, p, &info.codepoint)) return false; }
michael@0: action parse_cluster   { if (!parse_uint (tok, p, &info.cluster )) return false; }
michael@0: action parse_x_offset  { if (!parse_int  (tok, p, &pos.x_offset )) return false; }
michael@0: action parse_y_offset  { if (!parse_int  (tok, p, &pos.y_offset )) return false; }
michael@0: action parse_x_advance { if (!parse_int  (tok, p, &pos.x_advance)) return false; }
michael@0: action parse_y_advance { if (!parse_int  (tok, p, &pos.y_advance)) return false; }
michael@0: 
michael@0: unum	= '0' | [1-9] digit*;
michael@0: num	= '-'? unum;
michael@0: 
michael@0: comma = space* ',' space*;
michael@0: colon = space* ':' space*;
michael@0: 
michael@0: glyph_id = unum;
michael@0: glyph_name = alpha (alnum|'_'|'.'|'-')*;
michael@0: 
michael@0: glyph_string   = '"' (glyph_name >tok %parse_glyph) '"';
michael@0: glyph_number = (glyph_id >tok %parse_gid);
michael@0: 
michael@0: glyph	= "\"g\""  colon (glyph_string | glyph_number);
michael@0: cluster	= "\"cl\"" colon (unum >tok %parse_cluster);
michael@0: xoffset	= "\"dx\"" colon (num >tok %parse_x_offset);
michael@0: yoffset	= "\"dy\"" colon (num >tok %parse_y_offset);
michael@0: xadvance= "\"ax\"" colon (num >tok %parse_x_advance);
michael@0: yadvance= "\"ay\"" colon (num >tok %parse_y_advance);
michael@0: 
michael@0: element = glyph | cluster | xoffset | yoffset | xadvance | yadvance;
michael@0: item	=
michael@0: 	( '{' space* element (comma element)* space* '}')
michael@0: 	>clear_item
michael@0: 	@add_item
michael@0: 	;
michael@0: 
michael@0: main := space* item (comma item)* space* (','|']')?;
michael@0: 
michael@0: }%%
michael@0: 
michael@0: static hb_bool_t
michael@0: _hb_buffer_deserialize_glyphs_json (hb_buffer_t *buffer,
michael@0: 				    const char *buf,
michael@0: 				    unsigned int buf_len,
michael@0: 				    const char **end_ptr,
michael@0: 				    hb_font_t *font)
michael@0: {
michael@0:   const char *p = buf, *pe = buf + buf_len;
michael@0: 
michael@0:   /* Ensure we have positions. */
michael@0:   (void) hb_buffer_get_glyph_positions (buffer, NULL);
michael@0: 
michael@0:   while (p < pe && ISSPACE (*p))
michael@0:     p++;
michael@0:   if (p < pe && *p == (buffer->len ? ',' : '['))
michael@0:   {
michael@0:     *end_ptr = ++p;
michael@0:   }
michael@0: 
michael@0:   const char *tok = NULL;
michael@0:   int cs;
michael@0:   hb_glyph_info_t info;
michael@0:   hb_glyph_position_t pos;
michael@0:   %%{
michael@0:     write init;
michael@0:     write exec;
michael@0:   }%%
michael@0: 
michael@0:   *end_ptr = p;
michael@0: 
michael@0:   return p == pe && *(p-1) != ']';
michael@0: }
michael@0: 
michael@0: #endif /* HB_BUFFER_DESERIALIZE_JSON_HH */